I'm replacing (yet again) my bathroom dimmer switch. The old switch had 3 wires: 2 black and one green. The two black wires were attached to the wires coming out of the wall and the green wire was attached to nothing. The new switch has 4 wires: black, red, red/white striped, and green. Can I attach the new switch somehow? If not, what would you recommend when I only have 2 wires (circa 1930) coming out of the wall (besides rewiring my house)?
Electrical – How to wire up a 4-wire dimmer switch when I only have two 2 wires from the wall
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Best Answer
Not sure what make and model dimmer you're trying to install, so I'll describe a common installation. Wire colors could vary, depending on manufacturer.
From Lutron Luméa® Installation Guide
If you don't have grounding conductors in your home, you could install a GFCI breaker and you'll be code compliant.
Lutron devices typically have a red and a red/white stripped wire, whereas Leviton has two red wires.